I think @nokturnal is talking about the CLI? because the newest versions of the platforms is 3.6.3 and 3.6.4.

You can update your platforms to the newest one: cordova platform update ios
You can also install a specific platform like this: ionic platform add android@3.5.1
To see what versions of each platform you got you can do: cordova platforms

I use cordova CLI 4.0 and it seems to work fine. xCode 6.1 though… not so good…